The symptoms of a stuttering engine.

[Rugged Path]

There have been a few Q&A's on this problem. On my last ride on my 2002 1150gsa especially at low speeds, it was stuttering as if there was either water in the tank, coil problem or Hall effect sensor fault ;-).

Is there a difference between stuttering when there is more water than fuel being injected sporadically as tank contents always being filled and sloshed around and that when an electrical fault does not initiate a spark at random moments while riding?

A concise fault finding map diagram would be nice to simplify coming to a conclusion before asking forum members 'What'!

The coil and/or hall sensor fault is hidden from view unless the tool kit comes out and it is a sunny day.



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[Slipperyeel]

Interesting question.

With the 'water in the fuel' question. Would filing with fresh fuel not cause a change quickly enough allowing you to nail that?

For the electrics, they're always a pain! You need Steptoe or Mikeyboy's experience to home in on those faults quickly... Which means we need this forum

 

[Sergeant Pluck]

If it's water in fuel, the effect will get worse as the fuel level drops - from no ill-effect at all when full, to won't run at all when near empty. Because the water floats on top of the fuel. Water in fuel is a PIA because the only real way to get rid of it is to manually drain the tank. I once tried putting some kind of additive in the fuel (ethanol I think?) which supposedly temporarily 'dissolves' the water allowing it to pass through the system. Didn't work.

 

[Popell]

If it's water in fuel, the effect will get worse as the fuel level drops - from no ill-effect at all when full, to won't run at all when near empty. Because the water floats on top of the fuel. Water in fuel is a PIA because the only real way to get rid of it is to manually drain the tank. I once tried putting some kind of additive in the fuel (ethanol I think?) which supposedly temporarily 'dissolves' the water allowing it to pass through the system. Didn't work.

Pretty certain that the fuel floats on the water....

Methanol will take the water with it...where you get it from is another matter

 

[Sergeant Pluck]

Pretty certain that the fuel floats on the water....

Methanol will take the water with it...where you get it from is another matter

I stand corrected - got it the wrong way round - memory fail - as you were

 

[Steptoe]

Is there a difference between stuttering when there is more water than fuel being injected sporadically as tank contents always being filled and sloshed around and that when an electrical fault does not initiate a spark at random moments while riding?

A concise fault finding map diagram would be nice to simplify coming to a conclusion before asking forum members 'What'!

The coil and/or hall sensor fault is hidden from view unless the tool kit comes out and it is a sunny day.



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Fantastic... a concise diagram on the many different types of stuttering.

That sounds a recipe for more even confusion

 

[Rugged Path]

Something like a flowchart. It is something our US colleagues like to devise, it's just finding it.
Strangely, my bike was stuttering again this morning even after filling up from a near empty tank. Always more so at sedate speeds on the road. But, after parking up later for tea and butty, the return journey was completely different and any hiccups died away.


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